Standardize usage of virtual/override/final in extensions/

extensions/renderer/api_test_base.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_RENDERER_API_TEST_BASE_H_
 #define EXTENSIONS_RENDERER_API_TEST_BASE_H_
 
 #include <map>
 #include <string>
 #include <utility>
@@ skipping 12 matching lines @@
 
 namespace extensions {
 
 class V8SchemaRegistry;
 
 // A ServiceProvider that provides access from JS modules to services registered
 // by AddService() calls.
 class TestServiceProvider : public gin::Wrappable<TestServiceProvider> {
  public:
   static gin::Handle<TestServiceProvider> Create(v8::Isolate* isolate);
-  virtual ~TestServiceProvider();
+  ~TestServiceProvider() override;
 
-  virtual gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
+  gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
       v8::Isolate* isolate) override;
 
   template <typename Interface>
   void AddService(const base::Callback<void(mojo::InterfaceRequest<Interface>)>
                       service_factory) {
     service_factories_.insert(std::make_pair(
         Interface::Name_,
         base::Bind(ForwardToServiceFactory<Interface>, service_factory)));
   }
 
@@ skipping 39 matching lines @@
   void RunPromisesAgain();
 
   base::MessageLoop message_loop_;
   TestServiceProvider* service_provider_;
   scoped_ptr<V8SchemaRegistry> v8_schema_registry_;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_API_TEST_BASE_H_